dart - Flutter Drawer 作为单独的小部件不允许修改宽度

Question

尝试在新应用中实现侧边抽屉，我可以渲染它，但它覆盖了整个屏幕，这是我的设置方式:

首页:

class Home extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      drawer: SideDrawer(),
      body: Center(
        child: Text('Home page'),
      ),
    );
  }
}

抽屉小部件在一个单独的文件中:

class SideDrawer extends StatelessWidget {
  const SideDrawer({Key key, this.user}) : super(key: key);
  final FirebaseUser user;

  @override
  Widget build(BuildContext context) {
    return new SizedBox(
      width: MediaQuery.of(context).size.width * 0.85,
      child: Drawer(
          child: new ListView(
        children: <Widget>[
          new DrawerHeader(
            child: new Text("DRAWER HEADER.."),
            decoration: new BoxDecoration(color: Colors.orange),
          ),
          new ListTile(
            title: new Text("Item => 1"),
            onTap: () {
              Navigator.pop(context);
              Navigator.push(context,
                  new MaterialPageRoute(builder: (context) => new HomePage()));
            },
          ),
        ],
      )),
    );
  }
}

更新:抽屉应该从登录页面获取用户详细信息，我猜这里的问题与抽屉是从单独的主脚手架调用的事实有关，这就是为什么在尽管代码中设置了 85% 的屏幕区域，但它开始覆盖整个区域。

我试过this solution too但没用，有什么建议吗？

Answer 1

您的大部分代码都可以。但是，您应该只制作 Widget side(BuildContext context) 而不是制作 SideDrawer 类 extends StatelessWidget

这是完整的 main.dart

import 'package:flutter/material.dart';
import 'side.dart';
import 'user.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class HomePage extends StatefulWidget {
  HomePage({Key key, this.title}) : super(key: key);

  final String title;

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  User user = new User("name","firstname","adress","username");

 Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Home'),
      ),
      drawer: new SideDrawer(user:user),
      body: Center(
        child: Text('Home page'),
      ),
    );
  }
}

这是另一个包含 sideDrawer 的文件

import 'package:flutter/material.dart';
import 'main.dart';
import 'user.dart';

class SideDrawer extends StatelessWidget {

  const SideDrawer({Key key, this.user}) : super(key: key);
  final User user;

  @override
  Widget build(BuildContext context) {
      return new SizedBox(
        width: MediaQuery.of(context).size.width * 0.85,//20.0, 
        child: Drawer(
            child: new ListView(
          children: <Widget>[
            new DrawerHeader(
              child: new Text("DRAWER HEADER.."),
              decoration: new BoxDecoration(color: Colors.orange),
            ),
            new ListTile(
              title: new Text(user.name),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
            new ListTile(
              title: new Text(user.firstname),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
            new ListTile(
              title: new Text(user.adress),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
            new ListTile(
              title: new Text(user.username),
              onTap: () {
                Navigator.pop(context);
                Navigator.push(context,
                    new MaterialPageRoute(builder: (context) => new HomePage()));
              },
            ),
          ],
        )),
      );
    }
}

这就是它最终的表现:

跳这个对你有帮助。

问候

编辑:

我已经更新了代码和图片以满足您的需求。另外我制作了一个假的 User class 仅用于演示目的。